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The animal world, so far as true land-forms are concerned, is limited to types like the protozoa (lowest in the organic scale), rotifera and minute insect-like mites which lurk hidden away amongst the tufts of moss or on the under side of loose stones.
The rotifera were once supposed to be hermaphrodites, but the existence of sexes in one species has been clearly established.
In the radiated forms of the rotifera, and the simple structure of the polypi rudes, we are reminded of the radiata.